Casio G-Shock Master of G FROGMAN GWF-D1000BC-1ER

Professional watches designed to defy the limits of resistance: these MUDMASTER and FROGMAN models from the MASTER OF G line feature tan-colored details inspired by tactical gear. Devoid of superfluous decorations, the sober color palette emphasizes the line's commitment to functionality. The FROGMAN GWF-D1000BC features tan-colored details that create a high-impact effect in an all-black design, evoking the functional beauty of professional equipment. A DLC-coated bezel and black IP-treated front screws enhance the texture of the metal exterior, creating a refined balance between quality and functionality. The watch is also equipped with a composite band that combines metal and resin, thus ensuring strength and lightness. The band is also extendable, making it wearable even over a wetsuit. Every aspect has been designed with actual field use in mind. From the functional structure to the design, the color combination inspired by tactical gear reinforces the distinct identity of the MASTER OF G line.

Technical Specifications

Case

Dimensions: 59.2 × 53.3 × 18 mm
Weight: 181 g
Case and bezel material: Stainless steel / Resin
Construction: Shock-resistant
Water resistance: ISO 200-meter water resistance

Band

Material: Stainless steel / resin composite band
Clasp: Double-lock, 1-press 3-fold clasp, equipped with slide-adjust mechanism and extender
Adjustable length: 150 to 220 mm

Glass

Material: Sapphire glass with anti-reflective coating

Case back

Type: Screw lock back

Surface treatment

Treatment: DLC (stainless steel portion)

Power supply

Technology: Tough Solar (solar powered)

Time adjustment

Radio control: Radio-controlled watch; Multi Band 6

Sensor function

Digital compass: Measuring range from 0 to 359°; measuring unit 1°; 20 seconds continuous measurement; graphic direction pointer; auto-correction function; bearing correction (figure 8, 3-point); magnetic declination correction
Thermometer: Display range from -10 to 60 °C (14 to 140 °F); display unit 0.1 °C (0.2 °F); conversion between Celsius (°C) and Fahrenheit (°F)
Depth measurement: Measuring range from 0 to 80 m (0 to 262.5 ft); display unit 0.1 m (0.2 ft)

Diving function

Diving mode: Measuring range 0.0 to 80 m (0.0 to 262.5 ft); measuring unit 0.1 m (0.5 ft)
Dive time: 1-second increments, up to 5:59'59
Functions: Ascent time measurement; ascent speed alarm

Log data

Auto-log: Data for up to 20 logs (dive start year, month and day, start time, dive time, maximum depth, and minimum water temperature)
Time stamp: Up to 20 records (time, minutes, seconds, year, month, date, day; dive mode: depth and water temperature / compass mode: bearing angle / thermometer mode: temperature)

World time

Functions: 31 time zones (48 cities + Coordinated Universal Time), daylight saving on/off

Moon data

Functions: Moon data (moon age of the specific date, moon phase)

Tide graph

Functions: Tide graph (tide level for specific date and time)

Stopwatch

Type: 1/100-second stopwatch
Measuring capacity: 99:59'59.99''
Measuring modes: Elapsed time, split time, 1st-2nd place times

Timer

Type: Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)

Alarm / Hourly time signal

Alarms: 5 daily alarms (with 1 snooze alarm)
Hourly time signal: Yes

Light

Type: LED backlight (Super Illuminator)
Features: Full auto LED illumination, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
LED color: White

Calendar

Type: Full auto-calendar (up to year 2099)

Mute function

Button operation tone: On/off

Power saving

Function: Power saving (display goes blank to save power when the watch is left in the dark)

Battery

Indicator: Battery level indicator
Runtime: 7 months with rechargeable battery (operation period with normal use without exposure to light after charge); 23 months with rechargeable battery (operation period when stored in total darkness with the power save function on after a full charge)

Accuracy

Accuracy: ±15 seconds per month (with no signal calibration)

Other features

Format: 12/24-hour format
Regular timekeeping: Hour, minute, second, PM, month, date, day

Time adjustment details

Time calibration signals: DCF77 (Mainflingen, Germany) – 77.5 kHz; MSF (Anthorn, England) – 60.0 kHz; WWVB (Fort Collins, United States) – 60.0 kHz; JJY (Fukushima, Fukuoka/Saga, Japan) – 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga); BPC (Shangqiu City, Henan Province, China) – 68.5 kHz

Time calibration signal reception: Auto receive up to six times a day (remaining auto receives canceled as soon as one is successful); 5 times a day for the Chinese calibration signal; manual receive; display of the latest signal reception results